Acadian turbidites, folded during the Alleghanian Orogeny. Look for slickensides, trace fossils, turbidity current structures.
For more information on the Brallier, check out this map of the location:
ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=8643

Strained metaconglomerate that crops out in a stream in Klingle Valley, DC.
A slightly lower-positioned, closer version of this same outcrop is imaged in this second GigaPan: gigapan.com/gigapans/128509